I have two of these models (BD-J5700) and they both started doing this exact same thing approximately 8am central time, Saturday, June 20, 2020. Strange indeed!! I was at first thinking a power surge did something, so went online and found this discussion. Did Samsung get hacked??
From the web:
The last two days have seen a variety of Samsung Blu-ray players worldwide suddenly cease working. The symptom is that they turn on when power is applied, whereupon they reboot themselves every few seconds endlessly. The power and eject buttons are ignored and all attempts at resetting them fail. After many owners contacted Samsung support and were told they needed to send their players in for hardware repair, Samsung appears to have admitted there is a common problem, not individual player failure. As they are all out of warranty and the reboot cycle precludes the normal software update process, we are awaiting a solution from them.
Has anyone come up with a fix? I have two Blu-ray player BD-JM57C and both started this recycling issue. Yesterday the one in my office and today the one in my bedroom. Both were recently used with no issue.
It seem many more people is having the same exact issue at the same exact time.